This Smart Controller contains a SD-Card reader, an rotary encoder
and a 20 Character x 4 Line LCD display. You can easily connect it
to your RAMPS 1.4 board using the "smart adapter" included.

After connecting this panel to your RAMPS 1.4 you don't need your
PC any more, the Smart Controller supplies power for your SD card.
Further more all actions like calibration, axes movements can be
done by just using the rotary encoder on the Smart Controller.
Print your 3D designs without PC, just with a g-code design stored
on the SD card.